Originally Posted by Opie 1 Kenopie
Plenty happy with my Gen 3 29SF and 20SF. Not interested in yet another part that can come loose from the grip or another pin that can loosen over time. Add to that the potential for Gen 4 probs and it's just not worth it to me, since my 3's work 100%.
An addition to DM1906's inquiry:
The pin holding the replaceable backstrap on the gen4 is the original trigger block pin.
I have seen Glocks brought in where the owner is not using either of the gen4 grip extensions, and therefore leaves off that pin. They then wonder why the trigger malfunctions.